Network Working Group S. Herzog
Request for Comments: 2750 IPHighway
Updates: 2205 January 2000
Category: Standards Track
RSVP Extensions for Policy Control
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This memo presents a set of extensions for supporting generic policy
based admission control in RSVP. It should be perceived as an
extension to the RSVP functional specifications [RSVP]
These extensions include the standard format of POLICY_DATA objects,
and a description of RSVP's handling of policy events.
This document does not advocate particular policy control mechanisms;
however, a Router/Server Policy Protocol description for these
extensions can be found in [RAP, COPS, COPS-RSVP].
Herzog Standards Track [Page 1]RFC 2750 RSVP Extensions for Policy Control January 2000Table of Contents
1 Introduction.......................................................2
2 A Simple Scenario..................................................3
3 Policy Data Objects................................................3
3.1 Base Format.....................................................4
3.2 Options.........................................................4
3.3 Policy Elements.................................................7
3.4 Purging Policy State............................................7
4 Processing Rules...................................................8
4.1 Basic Signaling.................................................8
4.2 Default Handling for PIN nodes..................................8
4.3 Error Signaling.................................................9
5 IANA Considerations................................................9
6 Security Considerations............................................9
7 References........................................................10
8 Acknowledgments...................................................10
9 Author Information................................................10
Appendix A: Policy Error Codes......................................11
Appendix B: INTEGRITY computation for POLICY_DATA objects...........12
Full Copyright Statement ...........................................13
1 Introduction
RSVP, by definition, discriminates between users, by providing some
users with better service at the expense of others. Therefore, it is
reasonable to expect that RSVP be accompanied by mechanisms for
controlling and enforcing access and usage policies. Version 1 of the
RSVP Functional Specifications [RSVP] left a placeholder for policy
support in the form of POLICY_DATA object.
The current RSVP Functional Specification describes the interface to
admission (traffic) control that is based "only" on resource
availability. In this document we describe a set of extensions to
RSVP for supporting policy based admission control as well. The scope
of this document is limited to these extensions and does not advocate
specific architectures for policy based controls.
For the purpose of this document we do not differentiate between
Policy Decision Point (PDP) and Local Decision Point (LDPs) as
described in [RAP]. The term PDP should be assumed to include LDP as
well.
Herzog Standards Track [Page 2]RFC 2750 RSVP Extensions for Policy Control January 2000
2 A Simple Scenario
It is generally assumed that policy enforcement (at least in its
initial stages) is likely to concentrate on border nodes between
autonomous systems.
Figure 1 illustrates a simple autonomous domain with two boundary
nodes (A, C) which represent PEPs controlled by PDPs. A core node (B)
represents an RSVP capable policy ignorant node (PIN) with
capabilities limited to default policy handling (Section 4.2).
PDP1 PDP2
| |
| |
+---+ +---+ +---+
| A +---------+ B +---------+ C |
+---+ +---+ +---+
PEP2 PIN PEP2
Figure 1: Autonomous Domain scenario
Here, policy objects transmitted across the domain traverse an